# CVE-2018-14564: Null dereference in n/a

> A segmentation fault in the THULAC library allows attackers to cause a denial of service via crafted input.

- **Severity:** Critical 9.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Jul 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-9fgq-64pj-rjhp

## What is CVE-2018-14564?

CVE-2018-14564 is a critical vulnerability in n/a, published on 23 Jul 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in libthulac.so in THULAC through 2018-02-25. A SEGV can occur in NGramFeature::find_bases in include/cb_ngram_feature.h.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2018-14564?

It affects 1 product.


Products: Thunlp Thulac.

## How do I fix CVE-2018-14564?

No fix has been published for CVE-2018-14564 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-14564 being exploited?

There is no known exploitation of CVE-2018-14564 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2018-14562](https://insights.sbomify.com/CVE-2018-14562/): Null dereference in n/a (critical 9.8)
- [CVE-2018-14563](https://insights.sbomify.com/CVE-2018-14563/): Memory corruption in n/a (critical 9.8)
- [CVE-2018-14565](https://insights.sbomify.com/CVE-2018-14565/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-14564 and fix it if it is affected.

What it is: CVE-2018-14564 is a critical vulnerability in n/a, published on 23 Jul 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-14564 in the wild and no public exploit code.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2018-14564/ (Markdown: https://insights.sbomify.com/CVE-2018-14564/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-14564
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-14564
- OSV: https://osv.dev/vulnerability/CVE-2018-14564

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-14564/
Summaries are generated and may contain mistakes; the official description above is the record.